docs: September 2019 Documentation Update (#1379)

* docs: adjust wording of ActivityType.Watching enum

Adjusts the xmldoc summary wording of the ActivityType.Watching enum to
fix a wording issue.

* Add D.NET Logo to Open Graph meta tags

* Update DescriptionGenerator
...And update color to suit the logo better

* Disable smooth scrolling due to user complaints

* Remove unnecessary spacing in sideaffix

* Update footer version

* Remove featherlight plugin

As it is unnecessary and can break image tags

* Adjust wordings regarding safe-handling of secrets

* Fix formatting for first bot token sample

* Add badges to homepage

* Minor wording fixes on terminal

* Update to higher quality PNG

* Add Discord.Net.Example in sln for build validation

* Clarify all instances of IAsnycEnumerable

* Clarify overridden props in SocketNewsChannel

* Add returns and params docs for SyncPermissionsAsync

* Remove/fix invalid XMLdoc strings

* Remove AppVeyor and add GitHub badge

docs/index.md

@@ -5,7 +5,13 @@ title: Home
 
 # Discord.Net Documentation
 
-<div class="big-logo logo-switcher" />
+<div class="big-logo logo-switcher"></div>
+
+[![GitHub](https://img.shields.io/github/last-commit/discord-net/discord.net?style=plastic)](https://github.com/discord-net/Discord.Net)
+[![NuGet](https://img.shields.io/nuget/vpre/Discord.Net.svg?maxAge=2592000?style=plastic)](https://www.nuget.org/packages/Discord.Net)
+[![MyGet](https://img.shields.io/myget/discord-net/vpre/Discord.Net.svg)](https://www.myget.org/feed/Packages/discord-net)
+[![Build Status](https://dev.azure.com/discord-net/Discord.Net/_apis/build/status/discord-net.Discord.Net?branchName=dev)](https://dev.azure.com/discord-net/Discord.Net/_build/latest?definitionId=1&branchName=dev)
+[![Discord](https://discordapp.com/api/guilds/81384788765712384/widget.png)](https://discord.gg/jkrBmQR)
 
 ## What is Discord.Net?
 
@@ -20,11 +26,3 @@ If this is your first time using Discord.Net, you should refer to the
 More experienced users might want to refer to the
 [API Documentation](xref:API.Docs) for a breakdown of the individual
 objects in the library.
-
-## Additional Resources
-
-- [Discord API Guild](https://discord.gg/discord-api) - Look for `#dotnet_discord-net`
-- [GitHub](https://github.com/RogueException/Discord.Net/)
-- [NuGet](https://www.nuget.org/packages/Discord.Net/)
-- [MyGet Feed](https://www.myget.org/feed/Packages/discord-net) - Add-ons and nightly builds
-- [AppVeyor CI](https://ci.appveyor.com/project/RogueException/discord-net) - Nightly builds via Continuous Integration